Answer:
Step-by-step explanation:
Let
g ----> number of gallons of gasoline
c ---> the total cost in dollars
we have
<em>First gas station</em>
This is a proportional relationship between the variables c and g
The constant of proportionality k or unit rate (slope) is equal to
<em>Second gas station</em>
we have the ordered pairs
(2.5,8.30) and (5,16.60)
This is a proportional relationship between the variables c and g
The constant of proportionality k is equal to
the linear equation is
To find out how much per gallon would Billy save, subtract the unit rate of the Gas station 1 from the unit rate of the Gas station 2
so